Ex NWA now in Delta livery at Calgary International Airport, YYC
As of 30 September 2011, a total of 4,822 Airbus A320 family aircraft have been delivered, of which 4,729 are in active service. In addition, another 3,104 airliners are on firm order. According to Airbus, it ranked as the world's fastest-selling jet airliner family according to records from 2005 to 2007, and as the best-selling single-generation aircraft programme.
Canadian Aviation Blog